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libkernaux
==========
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Auxiliary library for kernel development.
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[Topic on OSDev.org forum ](https://forum.osdev.org/viewtopic.php?f=1&t=37958 ).
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Table of contents
-----------------
* [Overview ](#libkernaux )
* [Table of contents ](#table-of-contents )
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* [API ](#api )
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* [Headers ](#headers )
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* [Definitions ](#definitions )
* [Global variables ](#global-variables )
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* [Configuration ](#configuration )
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* [Non-default options ](#non-default-options )
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* [Default options ](#default-options )
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* [Tips ](#tips )
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* [Installation ](#installation )
* [Development ](#development )
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* [Cross ](#cross )
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API
---
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### Headers
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We use [semantic versioning ](https://semver.org ) for stable APIs. Stable APIs
can only change when major version number is increased (or minor while major is
zero). Work-in-progress APIs can change at any time.
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* Runtime environment
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* [Feature macros ](/include/kernaux/version.h.in ) (*work in progress*)
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* [Assertions ](/include/kernaux/assert.h ) (*non-breaking since* ** ?.?.?**)
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* [Assert ](/examples/assert.c )
* [Panic ](/examples/panic.c )
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* Stack trace *(planned)*
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* [Input/output ](/include/kernaux/io.h ) (*work in progress*)
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* Architecture-specific code (*work in progress*)
* [Declarations ](/include/kernaux/arch/ )
* [Functions ](/include/kernaux/asm/ )
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* Device drivers (for debugging only)
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* [Serial console ](/include/kernaux/console.h ) (*work in progress*)
* [Framebuffer ](/include/kernaux/framebuffer.h ) (*planned*)
* USB (*planned*)
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* Algorithms
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* [Simple command line parser ](/include/kernaux/cmdline.h ) (*non-breaking since* **0.2.0** )
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* [Example ](/examples/cmdline.c )
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* [Page Frame Allocator ](/include/kernaux/pfa.h ) (*work in progress*)
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* [Example ](/examples/pfa.c )
* Data formats
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* [ELF ](/include/kernaux/elf.h ) (*work in progress*)
* [Master Boot Record ](/include/kernaux/mbr.h ) (*work in progress*)
* [Multiboot 2 (GRUB 2) ](/include/kernaux/multiboot2.h ) (*work in progress*)
* Stivale 2 (Limine) (*planned*)
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* Utilities
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* [Measurement units utils ](/include/kernaux/units.h ) (*work in progress*)
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* [To human ](/examples/units_human.c )
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* [Memory map ](/include/kernaux/memmap.h.in ) (*non-breaking since* ** ?.?.?**)
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* [Example ](/examples/memmap.c )
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* [printf format parser ](/include/kernaux/printf_fmt.h ) (*work in progress*)
* Code from [https://github.com/mpaland/printf ](https://github.com/mpaland/printf ). Thank you!
* [Example ](/examples/printf_fmt.c )
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* Usual functions
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* [itoa/ftoa replacement ](/include/kernaux/ntoa.h ) (*non-breaking since* ** ?.?.?**)
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* [Example ](/examples/ntoa.c )
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* [printf replacement ](/include/kernaux/printf.h.in ) (*non-breaking since* ** ?.?.?**)
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* Code from [https://github.com/mpaland/printf ](https://github.com/mpaland/printf ). Thank you!
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* [fprintf ](/examples/fprintf.c )
* [vfprintf ](/examples/fprintf_va.c )
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* [snprintf ](/examples/snprintf.c )
* [vsnprintf ](/examples/snprintf_va.c )
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* libc replacement (*work in progress*)
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* [ctype.h ](/libc/include/ctype.h )
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* [inttypes.h ](/libc/include/inttypes.h )
* [setjmo.h ](/libc/include/setjmo.h )
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* [stdlib.h ](/libc/include/stdlib.h )
* [string.h ](/libc/include/string.h )
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* [sys/types.h ](/libc/include/sys/types.h )
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### Definitions
Define the following C preprocessor macros before including `<kernaux.h>` and
`<kernaux/*.h>` files. They have effect on your code, not the library code.
* `KERNAUX_DEBUG` - enable assertions
### Global variables
```c
// in < kernaux / assert . h >
void (*kernaux_assert_cb)(const char *file, int line, const char *msg)
```
Assertion callback. It's better to always set it to some function which always
interrupts the execution, even when debugging is disabled. It may for example
call `abort()` in hosted environment, raise an exception in Ruby, panic in Rust
or power off the machine in freestanding environment. It may also log the error
location and message.
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Configuration
-------------
Because this library has no external dependencies, we use **autoconf** features
to control behavior of the library, and packages to choose it's components.
Configuration options also follow the [semantic versioning ](https://semver.org )
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scheme and are split into stable and work-in-progress ones. Here we cover only
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stable options.
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### Non-default options
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#### Features
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* `--enable-freestanding` - build for freestanding environment
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* `--enable-split-libc` - split off libc
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* `--enable-tests` - enable usual tests and examples
* `--enable-tests-all` - enable all tests
* `--enable-tests-python` - enable tests that require Python 3 with YAML and
Jinja2
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#### Packages
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* `--with-libc` - provides the replacement for some standard C functions.
Useful in freestanding environment, where no libc is present.
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### Default options
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#### Features
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* `--(enable|disable)-debug` - debugging
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* `--(enable|disable)-float` - floating-point arithmetic
* `--(enable|disable)-werror` - fail on warning (`CFLAGS+='-Werror'`)
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#### Packages
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All packages are included by default. To exclude all packages except those
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explicitly included, use `--without-all` .
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* `--with[out]-cmdline` - command line parser
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* `--with[out]-file` - file simulator
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* `--with[out]-memmap` - memory map
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* `--with[out]-ntoa` - itoa/ftoa
* `--with[out]-printf` - printf
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Tips
----
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### Installation
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```
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./autogen.sh # if present
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./configure
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make
sudo make install
```
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This is just a usual library. You can use most of it's APIs in hosted
environment.
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### Development
```
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./autogen.sh # if present
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./configure --enable-tests # or --enable-tests-all, but see prerequisites
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make
```
You can test with `make check` .
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### Cross
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Create configuration script with `./autogen.sh` (if present).
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Let's assume that your target triplet is `i386-elf` . Configure with
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[cross-compiler ](https://wiki.osdev.org/GCC_Cross-Compiler ) in `$PATH` to make
without it in `$PATH` :
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```
./configure \
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--host='i386-elf' \
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--enable-freestanding \
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--with-libc \
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AR="$(which i386-elf-ar)" \
CC="$(which i386-elf-gcc)" \
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RANLIB="$(which i386-elf-ranlib)"
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```
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You can see the following messages. It's
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[a bug ](https://savannah.gnu.org/support/index.php?110393 ) in **autoconf** , just
ignore it.
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```
checking for _Bool... no
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checking stdarg.h usability... no
checking stdarg.h presence... yes
configure: WARNING: stdarg.h: present but cannot be compiled
configure: WARNING: stdarg.h: check for missing prerequisite headers?
configure: WARNING: stdarg.h: see the Autoconf documentation
configure: WARNING: stdarg.h: section "Present But Cannot Be Compiled"
configure: WARNING: stdarg.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stdarg.h... no
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checking stddef.h usability... no
checking stddef.h presence... yes
configure: WARNING: stddef.h: present but cannot be compiled
configure: WARNING: stddef.h: check for missing prerequisite headers?
configure: WARNING: stddef.h: see the Autoconf documentation
configure: WARNING: stddef.h: section "Present But Cannot Be Compiled"
configure: WARNING: stddef.h: proceeding with the compiler's result
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configure: WARNING: ## ---------------------------------------------------------- ##
configure: WARNING: ## Report this to https://github.com/tailix/libkernaux/issues ##
configure: WARNING: ## ---------------------------------------------------------- ##
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checking for stddef.h... no
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```
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To install into specific directory use full path: `DESTDIR="$(pwd)/dest" make
install` instead of `DESTDIR=dest make install` .
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Check if compilation targets i386: `objdump -d src/asm/i386.o` . It should output
something like this:
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```
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src/asm/i386.o: file format elf32-i386
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Disassembly of section .text:
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00000000 < kernaux_asm_i386_read_cr0 > :
0: 0f 20 c0 mov %cr0,%eax
3: c3 ret
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00000004 < kernaux_asm_i386_read_cr4 > :
4: 0f 20 e0 mov %cr4,%eax
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7: c3 ret
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00000008 < kernaux_asm_i386_write_cr0 > :
8: 8b 44 24 04 mov 0x4(%esp),%eax
c: 0f 22 c0 mov %eax,%cr0
f: c3 ret
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00000010 < kernaux_asm_i386_write_cr3 > :
10: 8b 44 24 04 mov 0x4(%esp),%eax
14: 0f 22 d8 mov %eax,%cr3
17: c3 ret
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00000018 < kernaux_asm_i386_write_cr4 > :
18: 8b 44 24 04 mov 0x4(%esp),%eax
1c: 0f 22 e0 mov %eax,%cr4
1f: c3 ret
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```